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Implementing hybrid interconnectivity →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the on-premises router is not advertising any routes to the Cloud Router. This is correct because the output shows both BGP sessions are in the Established state, yet the 'Received routes' count is zero for each peer, which means the Cloud Router is not learning any prefixes from the on-premises side. On the Google Professional Cloud Network Engineer exam, this scenario tests your ability to distinguish between a session being up and actual route exchange—a common trap where candidates assume an Established session guarantees route propagation. The key insight is that BGP session establishment only confirms TCP connectivity and OPEN message negotiation; route advertisement depends on the neighbor’s outbound policy or network statements. A useful memory tip is "Established does not equal advertised"—always check the received routes count to confirm bidirectional prefix sharing.

PCNE Implementing hybrid interconnectivity Practice Question

This PCNE practice question tests your understanding of implementing hybrid interconnectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Exhibit

Refer to the exhibit.

```
$ gcloud compute routers get-status my-router --region=us-central1
kind: compute#routerStatusResponse
result:
  router: my-router
  bgpPeerStatus:
  - name: peer-a
    ipAddress: 169.254.1.1
    peerIpAddress: 169.254.1.2
    status: UP
    numUp: 1
    numLearned: 0
    advertisedRoutes:
    - 10.0.0.0/8
    learnedRoutes: []
  - name: peer-b
    ipAddress: 169.254.2.1
    peerIpAddress: 169.254.2.2
    status: DOWN
    numUp: 0
    numLearned: 0
    advertisedRoutes: []
    learnedRoutes: []
```

A network engineer is troubleshooting connectivity between an on-premises network and Google Cloud. The on-premises router has two BGP sessions configured for redundancy with a Cloud Router. The engineer runs the command above. Which issue does the output indicate?

Question 1hardmultiple choice
Open the full BGP breakdown →

Exhibit

Refer to the exhibit.

```
$ gcloud compute routers get-status my-router --region=us-central1
kind: compute#routerStatusResponse
result:
  router: my-router
  bgpPeerStatus:
  - name: peer-a
    ipAddress: 169.254.1.1
    peerIpAddress: 169.254.1.2
    status: UP
    numUp: 1
    numLearned: 0
    advertisedRoutes:
    - 10.0.0.0/8
    learnedRoutes: []
  - name: peer-b
    ipAddress: 169.254.2.1
    peerIpAddress: 169.254.2.2
    status: DOWN
    numUp: 0
    numLearned: 0
    advertisedRoutes: []
    learnedRoutes: []
```

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The on-premises router is not advertising any routes to the Cloud Router

The output shows that both BGP sessions are established (state = Established), so options A and B are incorrect. However, the 'Received routes' count is 0 for both peers, meaning the on-premises router is not sending any routes to the Cloud Router. This prevents the Cloud Router from learning the on-premises prefixes, breaking connectivity from Google Cloud to on-premises.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Both BGP sessions are down

    Why it's wrong here

    peer-a is UP.

  • ✗

    The BGP session for peer-a is down

    Why it's wrong here

    peer-a status is UP.

  • ✓

    The on-premises router is not advertising any routes to the Cloud Router

    Why this is correct

    learnedRoutes is empty for peer-a, indicating no routes received from on-premises.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The Cloud Router is not advertising any routes to on-premises

    Why it's wrong here

    The Cloud Router is advertising routes (10.0.0.0/8), but that is not the issue.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates see 'Established' sessions and assume full connectivity, overlooking that BGP session up does not guarantee routes are being exchanged, which is the actual root cause of the connectivity failure.

Detailed technical explanation

How to think about this question

In BGP over Cloud Router, the 'show ip bgp summary' or equivalent output displays session state and route counts. A 'Received routes' count of 0 indicates the neighbor (on-premises router) is not sending any prefixes, often due to missing network statements, route filters, or prefix-lists on the on-premises side. This is a common misconfiguration when using dynamic routing with VPN or Dedicated Interconnect, where the on-premises router must explicitly advertise its VPC or on-premises subnets.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCNE question test?

Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The on-premises router is not advertising any routes to the Cloud Router — The output shows that both BGP sessions are established (state = Established), so options A and B are incorrect. However, the 'Received routes' count is 0 for both peers, meaning the on-premises router is not sending any routes to the Cloud Router. This prevents the Cloud Router from learning the on-premises prefixes, breaking connectivity from Google Cloud to on-premises.

What should I do if I get this PCNE question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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This PCNE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNE exam.